Dry fire extinguisher containing alpha pressure-gas cylinder



June 24, 1930. w. FRIEDRICH DRY FIRE EXTINGU ISHER CONTAINING A PRESSURE GAS CYLINDER Filed May 11, 192-1 When the gas Patented Ju'n'e' 24, 1930 Qumran STATES PATENT orncs WILHELM 3313133103, or BEnLrN-LaNxwrrz, GERMANY I Y ma rma nx'rmeursnnn; CONTAINING A ERESSURE-GAS cYLINmm Application fllcdiltay 11, 1927, Serial No. 190,541, and in Germany February 7,1927.

My invention relates to fire-extinguishers wherein powder is expelled bygas under pressure, more particularly carbonic acid gas. I y

5 According to the present-invention the gas cylinder is housed in a chamber disposed inside the container for the extinguishlng powder, which chamber is accessible from the exterior of the said container and can'be sealed.

cylinder is opened, the gas escapes first into the chamber surrounding the-said c linder and then passes in the form of a num er of jets from the chamber into the extinguishing powder container causes I 15-the powder to be broken up mainly against the walls of the powder container, impartmg a swirling movement to the powder so that it is mixed with the gas and issues from.

the discharge nozzleof the powder container in the-form of a cloud.

In order that the invention may be the better understood drawings are appended illustrating two different forms of the invention, in which Fig. 1 is a section through the longitudinal axis of the inventional apparatus, which at. the same time also passesthrough the chamber serving-for the reception of the compressed gas cylinder. vFig. 2 is a top plan view with a section through the safety valve. Fig; 3 is a lateral elevation of a the gas cylinder and sho the opening in the wall through which the as passes from this chamber into the powder chamber. Fig. 4 is a cross section through the intermediate .chamber ,onenlarged scale viewed from above Fig. 5 shows a half longitudinal section of the upper half -of the chamber for the gas cylinder also to a larger scale. 1

Fi 6 shows a, longitudinal-- section and Fig. a front view of a der container.-

15 Fig. 8 across section Fig. 1 1

Referring to Figs. 1 to 8 of the drawings, the container 1 for the powder has at its upper end an opening closed by means of a 0 screw cap 2 for the introduction of the pew to position the same.

part of the chamber serving for the reception of the openings under the pressure of the gas guard for thepow-- on line VI IIVI II' arranged in such ,a way that all-the jets when ipassing into,the powder'container 1 are led in the same lateral direction and in uch a der, and at its lower end a nozzle 3 through which the powder is discharged. Running longitudinally of and within the powder container '1 and spaced away from the wall thereof, preferably along the front side, that is above the nozzle 3, is a chamber 4 containing'the gas cylinder 5. Brackets 4cooperate with'the lower end of the chamber 4 lhis chamber 4 is closed at its lower end, but has an opening at its upper end closed by a screw cap 6 operable from the outside of said chamber and on which is a square plug or key 7' provided with a hand wheel 8, suitable provision being made to prevent the escape of the gasat this point. The key 7 engages'a slot provided in a screwed stopper 9 of the gas cylinder5, and the stopper 9 can be opened and closed by means of the key 7 by turning the handwheel 8. At its lower end the gas cylinder 5 is provided with a projection 10 which'engages a perforation in a plate 11 disposed within and at the lower end of the pressure chamber 4 in a manner as to prevent the cylinder 5 turning with the stopper 9 when the latter is turned. A spring 12 at the base of the chamber 4 holds the cylinder and presses it upwards, so that the key 7 alwalys engages with the slot of the stopper 9. 11 order to loosen the powder in the powder container 1 and to eject it through the nozzle 3, openings 13 are provided in the walls of the chamber as shown clearly in Fig. 3, said openings being covered by a leaf spring in such a way that they are kept closed by the said spring in order to pre ent the powder from entering the cham' er, said spring however being operated to uncover from chamber 4, and permitting. the gas to pass out in several separate jets. The dis-- charge openings 13 together with their covering spring or springs, as the case may be, are' way that the gasmu'st pass through the intermediates ace between the walls of the powder container 1 and the chamber 4 in sepa loo at the discharge openings rate jets as indicated by the arrow 14 in When, as aforesaid, a single covering member is provided for all the gas openings, the arrangement may comprise a steel band 15, Figs. 3 and 4 which covers all the openings 13 and is so arranged as to. be slidable into position from above into a covering or housing 16 which is formed as a circular shaped pocket, as shown in Figs. 3, 4, and 8. Openings 17 are provided in this pocket 16 coincident with the openings 13, whilst the whole of the rear rim and the uncut front rim are secured by riveting, welding, soldering, or any other convenient manner to the chamber 4. When the spring band is in position it covers all the discharge openings 13 of the chamber 4 and is lifted slightly 13, when there is any pressure in the chamber4, so as to allow the gas to issue through the openings 17 of cover 16 in the shape of separate fan-shaped jets. As the emission from all the jets is directed towards the same side, and the discharge openings are preferably disposed somewhat in front of the point where the walls of the powder container and the gas chamber. 4 are closest together, the gas jets must pass through this intermediate space, as shown by the arrow 14, Fig. 8, and then cir- "culate along theinner wall of the powder container 1, thus loosening and stirring up the powder against the wall of said container 1. The powder thus stirred up is then ejected together with the'gas in the form of a cloud through the nozzle 3.

In orderto ensure against there being too great a pressure in-the chamber 4, the cover 6 of same is provided with a recess 18 which is sealed by means of a thin plate 19 of sheet copper or the like soldered on the inside. The thickness of this sheet copper is such that the plate 19 is ruptured or actually torn out when the internal pressure of the chamber 4 rises above the gas to escape-to the atmosphere.

container desired point, thus allowing All riskof the chamber 4 burstin under excessive pressure is therefore avoi ed.

The powder container 1 is likewise protected against excess of pressure by a mushroom shaped safety valve 20, Fig. 2, which is held firmly pressed by a spring 21 against the valve seat 22 in the wall. 1

For the further protection ofthe powder 1, an opening 23 (Figs. 1, 6 and 7) is provided in the walls thereof, preferably at the bottom on the side which is located above the discharge nozzle3, and covered by a securely soldered safety plate 24 made of thin metal sheeting copper for example. The

powder container 1 is thus provided with a two-fold protection against excess pressure, namely,

pressure plate 24. This excess pressure plate 24 is situated above the discharge nozzlefi.

portion of the the safety valve and the excess the issuing gas weeps? When the plate 24 is ruptured, an extinguishing jet of powder and gas issues from the opening 23 and thus assists the effect of the extinguishing jet from the nozzle 3, consc-- quentlythe fracture of this excess pressure safeguard 24 does not interfere with the apparatus in its extinguishing work when it is in active use.

What I claim is z 1. A dry fire extinguisher comprising a powder container, a closure therefor, a container for gas under pressure; a closure for said container, a chamber disposed longitudinally within said powder container for said gas container, the chamber being spaced from the wall of said powder container, a closure for said chamber, means for admitting said gas from .the gas container to the chamber containing said gas container, openings disposed at mtervals along the chamber means cooperating with said openings for causing a substantially unidirectional, circumferential flow of gas around said wall and a nozzle 1 upon said powder container of the powder.

. l 2. A dry fire extinguisher comprising a powder container, a closure therefor, a container for gas under pressure, a closure for said container, a chamber disposed within the powder container, the chamber being spaced from the wall of said powder con-' tainer, said gas container having an opening, a screw plug for said opening, means operable from the exterior for operating said plug to control the passage of gas from the gas container to the chamber containing it, means for preventing the rotation of said container when the plug is operated, openings disposed at intervals along the chamber for the passage of the gas, deflector means cooperating with said openings for causing a substantially circumferential flow of gas around said wall and a nozzle upon said powder container for the discharge of the powder.

3. A dry. fire extinguisher comprising a powdercontainer, a closure therefor, a container for gas under pressure, said container, a chamber disposed within and longitudinally of said powder container for said gas container the chamber being for the discharge a closure for spaced from the wall of said powder container anopening in the gas container, a screw plug for said opening,

the passage of gas from the gas container to the chamber containing the same, means for preventing the rotation of the said container when the plug is operated, openings disposed at intervals along the chamber between said chamber and the powder receptable, said openings being disposed adjacent the wall of the powder container and arranged to cause jets to sweep round the wall of said powder container in one direction,

means operable from the exteriorfor operating sa'd plug to control for said gas container,

and a nozzle upon said powder container for the discharge of the powder.

, 4. A dry fire extinguisher comprising a powder container, a closure therefor, a. container for gas under pressure, a closure for said container, a chamber disposed within and lon for sai ga's container, the chamb spaced from the wall of said powder container, said gas container having an opening, a screw plu for said opening, means operable from t e exterior for operating said plug to control the passa e of gas from the gas container to the cham er containing the same openings disposed at intervals along the c iamber and arranged to cause the issuinggas jets to sweep round the walls of said powder container in one direction for the discharge of the powder, said openings being disposed adjacent the wall of the powder container a plate supporting said gas container, a perforation in said plate, a projectlon on said container extending'into said perforation andengaging said plate, and a springto press said container upwards to maintain the engagement of the plug with its operating means. v 4

5. VA dry-fire'extinguisher comprising a powder container, a closure therefor, a container for gas under pressure, a closure for said conta 1ner,-a chamber disposed within and longitudinally of said powder container the chamber being spaced from the wall, of said powder container; said gas container having an opening,

a screw plug for said opening, means operable from the exterior for operating said plug comprising a screw plug mounted inthe cover of the chamber, means for manually operating said plug, a projection on the inner end of said plug, a recess in the plug in the gas container for receiving the projection on the first plug whereby the passage of the gas from the gas container is controlled,

, means for preventing the rotation of the said container when the plug is operated, 0 enings arranged at intervals along the cham er, said openings being disposed ad acent said wall of said powder container to cause gas ets to sweep round thewall of said powder container in one direction, and a nozz e upon said. powder container for the discharge of the powder.

6. A dry fire extinguisher comprising a powder container, a closure therefor, a container for gas under pressure, a closure for said container, a chamber disposed within and longitudinally of said powder container for said gas container, the chamber being spaced from the wall of said powder container, said gas container ha'vmg an opening, a screwed plug for said opening, means-operable from the exterior for operating said plug to control the passageof gas from the gas container to the chambercontaining it,

tudinally of said powder containerer being ,tainer for said container,

' closing said openings to openings disposed at intervals longitudinally of the said chamber, resilient means closing said openings to prevent the passage of the powder, but yieldable to permit the passage of the gas and arranged to cause the issuing gas jetssat s weep round the wall of said; powder containei' inppe direction, and a nozzle for the discharge ofthdpowder.

7. A dry fire extinguisher comprising a powder container, a closure therefor, a container for gas under pressure a closure forsaid container, a chamber within said powder container for said gas container, the chamber being spaced from the wall of said powder container a closure for said chamber, means for admitting gas from said gas container to said chamber, openings disposed at intervals along the chamber and arranged to cause gas jets to sweep round the wall of said powder container in one direction, a nozzle upon said powder receptacle, an opening in the wall of said powder container, a frangible disc closing said opening and adapted to be broken under excessive pressure of the gas. I v 8. A dry fire extinguisher comprising a powder container, a closure therefor, a congasunder pressure, a closure for a chamber disposed within and longitudinally of said powder container for said gas container, the chamber being spaced from the wall of said powder container, said gas container having an opening,( a screw plug for said opening means operable from the exterior for operating said plug to control the passage of gas from the gas container to the chamber containing the same, openings disposed at intervals longitudinally of the said chamber, resilient means revent the passage of the powder, but yiel able to permit the passage of the gas said means cooperating with said openings to cause'the issuing. as jets to sweep round the wall of said pow ercontainer in one direction, a nozzlerfor the discharge of the powder, and a spring valve 119 tainer for gas under pressure, a closure for said container, a chamber disposed within and ion itudinally of said powder-container for sai gas container, the chamber being spaced from the wall ofsaidpowder con- 119 tainer, said gas container having an opening,

a screw plug for said opening, means operable from the ,exterior for operating said, plug to control the passage of gas from the gas container to the chamber containing the same, openings disposed at intervals longitudinally of said chamber and adjacent saidwallof saidv powder container, resilient means closing said openings to prevent the passage of the powder, but yieldable to perprisin a thin stri gas whereby the issuing gas is cause the gas, said means oomof material, a longitudinally isposed poo et upon the outside of the wall of the chamber, openings at one side of said pocket for the escape of the gas when the strip is raised under the pressure of- Said tn the wall of said powder condirection and a nozzle for the mit the passage of sweep round tamer 1n one discharge of the powder from said powder container.

In testimony whereof I have efiixed my signature.

WILHELM FRIEDRICH.

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